The phrase "a parallel route" is correct and usable in written English.
It can be used when discussing alternative paths or methods that run alongside a primary route or approach.
Example: "If the main road is closed, we can take a parallel route to reach our destination."
Alternatives: "an alternative path" or "a side route".
A parallel route network was established to mirror Heathrow's.
Along a parallel route the Belgian lawyer Gustave Rolin-Jaequemyns established an Institute of International Law in Ghent in 1873.
Either you will be as mediocre as they are, or you will rise above it and create a parallel route".
(Guillermo del Toro, the third high-profile Mexican film-maker to successfully cross over to Hollywood, has come through a parallel route of genre and fantasy film-making: his best Oscar performance was winning three for Pan's Labyrinth in 2007).
Figure 10 corresponds to the normalized impulse responses which were obtained along a parallel route to the radiating cable in the corridor.
But while it disentangles itself, TFT and its allies have taken a parallel route, scouting around the edges of government concerns and heading down the track of consumer and corporate engagement - and scored something of a success.
But some of those riders on the 720 Rapid may have transferred to the Expo Line, which runs along a roughly parallel route a few miles to the south.
Work began in 1938 on a north-south line under State Street that was completed in 1943, and a second, parallel route under Dearborn Street opened in 1950.
Heading north from my house, for example, it recommended riding on a dangerously busy arterial road rather than on a parallel cycle route on quieter residential streets.
Because of the broken drill, a second shaft was started this morning as a parallel escape route, 70 feet beyond the first.
As whites from Arkansas, Oklahoma and Texas traveled west along Route 66 looking for work, blacks from the same states made their way along a parallel course, Route 60, ending up in tiny, unincorporated towns like Randolph that were near the fields and had too few white families to keep them out.
